1104 input signal issue

[AlkaMotors]

@conuthead
running at 1104 input , has breaks from time to time (motor stops spinning for ca 120ms)
if you spin slightly higher or lower it does not happen !

yellow is proshot imput
light blue is computeProshotDMA (at function begin)
magenta is calcCRC == checkCRC
dark blue is motor output

Originally posted by @adrianmiriuta in #1 (comment)

[AlkaMotors]

OK, it was frame corruption that was causing the issue. The 1104 input signal is the same as dshot number 256. When a corrupt frame would happen the dshot number was calculated a 8 bits less and the crc did not pick it up. The dshot number would be read as a 0 which would stop the esc until the zero cross time out happens and the esc restart. I have worked around by just requiring two correct signals in a row for the dshot numbers 0 - 47. I will push changes when i have tested a bit more.

[adrianmiriuta]

@conuthead
cool

[AlkaMotors]

OK, the fixed code is up for the signal corruption in dshot and proshot. The next plan I will decrease the buffer length to capture a single signal instead of a double length buffer.
Thanks for noticing the corruption! That was a major problem. I did not notice in my testing as I am using a servo input signal. That issue had the potential to make the motor start running backwards !
The changed version runs much better throughout the rpm range now. I still don't know about how high it can go erpm but motors are on the way!